National Standard of the People's Republic of China
GB50325-2001
Code for indoor environmental pollution control of civilbuilding engineering
(2006 edition)
Published on November 26, 2001
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Ministry of Construction of the People's Republic of China
Implementation on January 1, 2002
Jointly issued
National Standard of the People's Republic of China
Code for indoor environmental pollution control of civilbuilding engineering engineering
GB50325-2001
(2006 edition)
Editing department: Henan Provincial Department of Construction
Approving department: Ministry of Construction of the People's Republic of China Effective date: January 1, 2002
China Planning Press
2006 Beijing
Notice on the issuance of the national standard "Code for Indoor Environmental Pollution Control of Civil Construction Engineering"
Jianbiao (2001) No. 263
In accordance with the requirements of our ministry's "Notice on Issuing the "2000-2001 National Standard Formulation and Revision Plan for Engineering Construction" (Jianbiao [2001] No. 87), the "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" jointly compiled by the Henan Provincial Department of Construction and relevant departments has been reviewed and approved as a national standard by relevant departments, with the number GB50325-2001, and will be implemented on January 1, 2002. Among them, 1.0.5, 3.1.1, 3.1.2, 3.2.1, 4.1.14.1.2, 4.2.4, 4.2.5, 4.2.64.3.14.3.3, 4.3.10
4.3.11, 5.1.2, 5.2.15.2
35.2.5, 5.2.6, 5.3.3, 5.3.66.0.3, 6.0.4, 6.0.186.0.20 are mandatory provisions and must be strictly enforced. The Ministry of Construction is responsible for the management and interpretation of the mandatory provisions of this code, the Henan Provincial Academy of Building Science is responsible for the interpretation of the specific technical content, and the Standard and Norm Research Institute of the Ministry of Construction organizes the China Planning Press to publish and distribute it. Ministry of Construction of the People's Republic of China
November 26, 2001
This specification is based on the requirements of the Ministry of Construction's Document No. 87 (2001), and is compiled by the Henan Provincial Academy of Building Science, Suzhou Health Testing Center, National Construction Engineering Quality Supervision and Inspection Center, Henan Provincial Radiation Environment Monitoring Management Station, Suzhou Urban Construction and Environmental Protection College, Nankai University, and Tsinghua University. On November 26, 2001, the Ministry of Construction approved it with Document No. 263 (2001), and jointly issued it with the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. During the compilation process, the compilation team conducted targeted verification research based on the investigation of a large number of domestic and foreign standards and research results, combined with my country's situation, and put forward a draft for comments. After extensively soliciting opinions nationwide and repeatedly revising the draft for review, the Henan Provincial Construction Department and relevant departments jointly reviewed and finalized it. This specification is to control the indoor environmental pollution caused by building materials and decoration materials, and puts forward specific technical requirements for the selection, investigation, design, construction, acceptance and other work tasks of building materials and decoration materials and engineering testing, based on the construction stages of engineering investigation, design, construction, acceptance, etc. In the process of compiling this specification, the current development level of my country's construction industry, the current development status of the building materials and decoration materials industry, combined with the direction of my country's industrial structure adjustment in the new century, and reference to relevant domestic and foreign standards and specifications.
This specification is divided into six chapters and six appendices. They are: General Principles, Terminology, Materials, Engineering Investigation and Design, Engineering Construction, Acceptance and Appendix.
In the process of implementing this code, we hope that all units will pay attention to accumulating information and summarizing experience in their work practice. If any modifications or additions are found, please send your opinions and relevant information to the National Standard Management Group of "Code for Indoor Environmental Pollution Control of Civil Building Engineering" of Henan Academy of Architectural Science, No. 4 Fengle Road, Zhengzhou City (Postal Code: 450053, Fax: 0371-3929453, E-mail:
[email protected]) for reference in future revisions.
Editor-in-chief, co-editor and main drafter of this code: Editor-in-chief: Henan Academy of Building Science Co-editor: Suzhou Health Testing Center National Construction Engineering Quality Supervision and Inspection Center Henan Radiation Environment Monitoring Management Station
Suzhou Urban Construction and Environmental Protection College
Nankai University
Tsinghua University
Main drafters: Wang Xiyuan, Liu Hongkui, Pan Hong, Xiong Wei, Han Huafeng, Shen Jianyu, Zhu Jun, Ba Songtao, Ma Liangcai, Zhu Qianghua, Ding Jiansen, Pei Yuren , Dai Shugui, Zhou Zhongping 1 General Principles
2 Terminology
3 Materials
3.1 Inorganic non-metallic building main materials and decoration materials 3.2 Artificial wood panels and veneer artificial wood panels
3.3 Coatings
3.4 Adhesives
3.5 Water-based treatment agents
4 Engineering survey and design
4.1 General provisions
4.2 Investigation of hydrogen concentration in soil at the project site and hydrogen prevention 4.3 Material selection
5 Engineering Construction
bzxz.net5.1 General Provisions
52. Inspection of Materials Upon Arrival
5.3 Construction Requirements
6 Acceptance
Appendix A Determination of Free Formaldehyde Release in Materials by Environmental Test Chamber MethodAppendix B Determination of Benzene in Indoor Air
Appendix C Determination of Volatile Organic Compounds (VOCs) and Benzene Content in Solvent-Based Coatings and Solvent-Based AdhesivesC.1 Determination of Volatile Organic Compounds (VOCs) Content in Solvent-Based Coatings and Solvent-Based AdhesivesC.2 .2 Determination of benzene content in solvent-based coatings and solvent-based adhesives Appendix D Determination of hydrogen concentration in soil and hydrogen evolution rate on soil surface Appendix E Determination of total volatile organic compounds (TVOC) in indoor air Explanation of terms used in this specification
Appendix: Explanation of clauses
1 General
1.0.1 This specification is formulated to prevent and control indoor environmental pollution caused by building materials and decoration materials in civil construction projects, protect public health, safeguard public interests, and achieve advanced technology and economic rationality. 1.0.2 This specification is applicable to indoor environmental pollution control of newly built, expanded and renovated civil construction projects, and is not applicable to industrial construction projects, warehousing construction projects, structures and rooms with special purification and sanitation requirements. Note: The indoor environmental pollutants referred to in this specification refer to indoor environmental pollution caused by building materials and decoration materials. After the civil construction project is delivered for use, the indoor environmental pollution caused by non-building decoration materials is not within the control scope of this specification. 1.0.3 The indoor environmental pollutants controlled by this code include hydrogen (Rn-222), formaldehyde, ammonia, benzene and total volatile organic compounds (TVOC).
1.0.4 According to different requirements for controlling indoor environmental pollution, civil construction projects are divided into the following two categories: 1. Class I civil construction projects: residential buildings, hospitals, elderly buildings, kindergartens, school classrooms and other civil construction projects;
2. Class II civil construction projects: office buildings, shops, hotels, cultural and entertainment venues, bookstores, libraries, exhibition halls, gymnasiums, public transportation waiting rooms, restaurants, barber shops and other civil construction projects. 1.0.5 The building materials and decoration materials selected for civil construction projects must comply with the provisions of this code. 1.0.6 In addition to complying with the provisions of this code, the control of indoor environmental pollution in civil construction projects shall also comply with the provisions of the relevant mandatory standards currently in force in the country. 2 Terms
2.0.1 Civil building engineering Civil building engineering The civil building engineering referred to in this code is a general term for newly built, expanded and renovated civil building structure engineering and decoration engineering.
2.0.2 Environmental test chamber environmental test chamber Equipment that simulates indoor environment to test the release of pollutants from building materials and decoration materials. 2.0.3 Soil surface hydrogen evolution rate radone evolution rate from soil surface The radioactivity (Bq) of hydrogen evolved per unit area (m) and per unit time (s). 2.0.4 Internal exposure index internal exposure index (IRa) refers to the quotient obtained by dividing the radioactivity specific activity of the natural radioactive nuclide radium-266 in building materials by the limit of 200 specified in this code. 2.0.5 External exposure index external exposure index (1.) refers to the sum of the quotients of the radioactive specific activity of natural radionuclides radium-266, promethium-232 and potassium-40 in building materials divided by the limits specified in this standard when each of them exists alone.
I r=CRa/370+CTh/260+Ck/4200
Where: CRa, CTh, Ck----respectively refer to the radioactive specific activity of natural radionuclides radium-266, promethium-232 and potassium-40 in building materials, becquerel/kilogram (Bq/kg). 2.0.6 Hydrogen concentration radon consistency
The actual measured content per unit volume of air. 2.0.7 Wood-based panels Wood-based panels are made of plant fibers, separated into unit materials of various shapes by mechanical processing, and then combined and pressed with adhesives, including plywood, fiberboard, particleboard, etc.
2.0.8 Decorated wood-based panels Decorated wood-based panels are panels that are based on artificial wood panels and are coated or laminated with various decorative materials. 2.0.9 Water-based coatings Water-based coatings Coatings that use water as a diluent.
2.0.10 Water-based adhesives Water-based adhesives Adhesives that use water as a diluent.
2.0.11 Water-based treatment agents Water-based treatment agents Liquids that use water as a diluent and can penetrate into building materials and decoration materials to improve their flame retardant, waterproof, anti-corrosion and other properties.
2.0.12 Solvent-based coatings Solvent-thinned coatings Coatings that use organic solvents as diluents. 2.0.13 Solvent-thinned adhesives Adhesives that use organic solvents as diluents. 2.0.14 Content of released formaldehyde The amount of free formaldehyde released by the material under the test conditions of the environmental test chamber method or the dryer method.
2.0.15 Content of free formaldehyde The amount of free formaldehyde contained in the unit mass of the material under the test conditions of the perforation method. 3 Materials
3.1 Inorganic non-metallic building materials and decoration materials 3.1.1 The radioactive index limits of inorganic non-metallic building materials such as sand, stone, brick, cement, commercial concrete, prefabricated concrete components and new wall materials used in civil construction projects shall comply with the provisions of Table 3.1.1.
Table 3.1.1 Determination items for radioactive index limits of inorganic non-metallic building main materials
Internal exposure index Ira
External exposure index I
3.1.2 When inorganic non-metallic decoration materials used in civil construction projects, including stone, building sanitary ceramics, gypsum boards, ceiling materials, inorganic porcelain tile adhesives, etc., are classified, their radioactive index limits shall comply with the provisions of Table 3.1.2. Table 3.1.2 Items for determination of radioactive index limits of inorganic non-metallic decoration materials
Internal irradiation index (IRa)
External irradiation index (I)
3.1.3 For building materials with a hollow ratio (void ratio) greater than 25%, the radioactive specific activity of natural radionuclides radium-226, protoplasmium-232, and potassium-40 shall simultaneously meet the requirements of internal irradiation index (IRa) not greater than 1.0 and external irradiation index (I) not greater than 1.3.3.1.4 The test methods for radioactive indexes of building main materials and decoration materials shall comply with the provisions of the current national standard "Radioactive Nuclides Limits for Building Main Materials" GB6566. 3.2 Artificial wood boards and veneer artificial wood boards
3.2.1 Artificial wood boards and veneer artificial wood boards for indoor use in civil construction projects must be tested for free formaldehyde content or free formaldehyde release.
3.2.2 Artificial wood panels and veneer artificial wood panels shall be classified into E1 and E2 according to the free formaldehyde content or free formaldehyde emission limit.
3.2.3 When the free formaldehyde emission is determined by the environmental test chamber method and the artificial wood panels are classified accordingly, the limit shall comply with the provisions of Table 3.2.3. Table 3.2.3 Free formaldehyde emission limit determined by environmental test chamber method Category
Limit (mg/m3)
3.2.4 When the free formaldehyde emission is determined by the perforation method and the artificial wood panels are classified accordingly, the limit shall comply with the provisions of Table 3.2.4. Table 3.2.4 Limits of free formaldehyde emission determined by perforation method Category
Limit (mg/100g, thousand materials)
≥9.0, ≤30.0
3.2.5 When the free formaldehyde emission is determined by the dryer method and the artificial wood board is classified accordingly, the limit shall comply with the provisions of Table 3.3.4. Table 3.2.5 Limits of free formaldehyde emission determined by the dryer method Category
Limit (mg/L)
>1.5, ≤5.0
3.2.6 The free formaldehyde emission of veneered artificial wood board can be determined by the environmental test chamber method or the drying method. In case of dispute, the determination result of the environmental test chamber method shall prevail: the free formaldehyde emission of plywood and blockboard should be determined by the dryer method: the free formaldehyde content of particleboard, medium density fiberboard, etc. should be determined by the perforation method. 3.2.7 The environmental test chamber method should be carried out in accordance with Appendix A of this specification. 3.2.8 The perforation method and the dryer method should comply with the provisions of the current national standard "Test Methods for Physical and Chemical Properties of Artificial Boards and Facing Artificial Boards" GB/T17657-1999. 3.3 Coatings
For water-based coatings used indoors in civil construction projects, the content of volatile organic compounds3.3.1
(VOCs) and free formaldehyde should be measured, and the limits should comply with the provisions of Table 3.3.1. Table 3.3.1 Determination items for the limits of volatile organic compounds (VOCs) and free formaldehyde in water-based paints for indoor use
VOCs (g/L)
Free formaldehyde (g/kg)
≤200
3.3.2 Solvent-based paints for indoor use in civil construction projects should be mixed according to the maximum dilution ratio specified, and the contents of volatile organic compounds (VOCs) and benzene should be determined. The limits should comply with the provisions of Table 3.3.2.
Table 3.3.2 Limits of volatile organic compounds (VOCs) and benzene in solvent-based paints for indoor use Paint name
Alkyd paint
Nitro clear paint
Polyurethane paint
Phenolic paint
Phenolic magnetic paint
Phenolic anti-rust paint
Other solvent-based paints
VoCs (g/L)
≤550
≤7 50
≤700
≤500
≤380
≤270
≤600
Benzene (g/L)
3.3.3 After the content of free toluene diisocyanate (TDI) in the curing agent is determined, the content of free toluene diisocyanate (TDI) in the polyurethane paint should be calculated according to the minimum dilution ratio specified, and should not be greater than 7g/Kg. The determination method should comply with the provisions of the national standard "Gas chromatography determination of unreacted toluene diisocyanate (TDI) monomer in urethane prepolymers and coating solutions" GB/T18446-2001. 3.3.4 The determination method of volatile organic compounds (VOCs) and free formaldehyde content in water-based paints should be carried out in accordance with the methods in Appendix A and Appendix B of the national standard "Limits of Hazardous Substances in Interior Wall Paints for Interior Decoration and Renovation Materials" GB18582-2001. 3.3.5 The determination method of volatile organic compounds (VOCs) and benzene content in solvent-based paints should be carried out in accordance with Appendix C of this specification.
3.4 Adhesives
3.4.1 The volatile organic compounds (VOCs) and free formaldehyde content of water-based adhesives used indoors in civil construction projects should be determined, and their limits should comply with the provisions of Table 3.4.1. Table 3.4.1 Determination items for volatile organic compounds (VOCs) and free formaldehyde limits in water-based adhesives for indoor use
VoCs (g/L)
Free formaldehyde (g/kg)）
3.4.2 For solvent-based adhesives for indoor use in civil construction projects, the content of volatile organic compounds (VOCs) and benzene shall be determined, and the limits shall comply with the provisions of Table 3.4.2. Table 3.4.2 Determination items for volatile organic compounds (VOCs) and benzene limits in solvent-based adhesives for indoor use
VoCs (g/L)
Benzene (g/kg)
≤750
3.4.3 The content of free toluene diisocyanate (TDI) in polyurethane adhesives should be determined, and should not be greater than 10g/kg. The determination method can be carried out according to the national standard "Gas chromatography determination of unreacted toluene diisocyanate (TDI) monomer in urethane prepolymers and coating solutions" GB/T18446-2001.
3.4.4 The determination method of volatile organic compounds (VOCs) and free formaldehyde content in water-based adhesives should be carried out according to the methods in Appendix A and Appendix B of the national standard "Limits of Hazardous Substances in Interior Wall Coatings for Interior Decoration and Renovation Materials" GB18582-2001. 3.4.5 The determination method of volatile organic compounds (VOCs) and benzene content in solvent-based adhesives should comply with the provisions of Appendix C of this specification.
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